package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Slf4j
@Aspect
@Component
public class AutoFillAspect {

    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}


    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("填充公共字段...");
        MethodSignature signature=(MethodSignature)joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//方法的注解对象
        OperationType operationType=autoFill.value(); // 从注解中拿数据，得知该方法的操作类型
        //获取到当前被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0){
            return;
        }

        Object entity = args[0];

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //class 对象 接下来便是反射的知识获取成员方法
        Class entityClass=entity.getClass();
        try{
            if(operationType==OperationType.INSERT){
                Method setCreateTime=entityClass.getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
                Method setUpdateTime=entityClass.getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setCreateUser=entityClass.getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
                Method setUpdateUser=entityClass.getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
                setCreateTime.invoke(entity,now);
                setUpdateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateUser.invoke(entity,currentId);
            } else if (operationType==OperationType.UPDATE) {
                Method setUpdateTime=entityClass.getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser=entityClass.getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            }
        }catch (Exception e){
            log.info(e.getMessage());
        }


    }
}
